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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4025502d7d48d4e6f1a597e5c6551c8bf6f70a8b110634065cbe3ef67b568d6' 
  AND token = 'Y181yrcozEHXTXL3xQ9/vesfFdDanQuZs0xUun/s68g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}